Top 14 Preview: Round 22

Toulouse host Stade FranÃ§ais in their gala clash at the end of a Top 14 weekend that starts with Toulon heading to Spain.

Toulouse host Stade FranÃ§ais in their traditional gala clash at the end of a Top 14 weekend that could go a long way in deciding who makes the play-offs.

League leaders Toulon and Clermont both visit the Basque country, where Toulon kick the action off in Spain against Bayonne before Clermont take on Biarritz, as they prepare for their respective Heineken Cup quarter-finals in a fortnight.

At the other end of the table, Bordeaux-BÃ¨gles have a golden opportunity to relieve their relegation worries at home to Mont-de-Marsan but Agen have no suck luck as they must travel to fortress Pierre Antoine in Castres.

After smashing Bayonne 59-0 on home soil, Toulon will arrive in Spain full of confidence for the return leg. With five rounds left to play, RCT know another full house of points will leave them in pole position for automatic semi-final qualification.

Toulon have the league's best attack with 51 tries in 21 games and owe their two-point lead over Clermont to their bonus points. By contrast, Bayonne have scored just 18 tries this season, the second-worst record in the championship.

Just four points clear of the relegation zone, Bordeaux-BÃ¨gles cannot afford to slip up at home against a side that will surely get the chop.

Never have both promoted clubs managed to retain their places in the Top 14 and, in contrast to Grenoble, Mont-de-Marsan look set to confirm that trend.

Les Montois won the last two games between these sides, but those were in the Challenge Cup. In domestic action, UBB have won the last six clashes between these teams.

Previous result: Bordeaux-BÃ¨gles won 17-12Prediction: UBB look like a solid bet, but it won't be pretty. Bordeaux-BÃ¨gles by six pointsKick-off: 18:45 (17.45 GMT)Referee: Christophe Berdos

Castres Olympique v SU AgenStade Pierre Antoine, Castres

Agen travel to one of the most difficult places to visit in France in desperate need of a result. Stuck in the drop zone, Les Agenais have a very tough end-of-season schedule including games against Clermont, Perpignan and Toulon.

The bad news for Saturday's visitors to Stade Pierre Antoine is that they have lost on their last three visits to the Tarn and Castres have lost just once at home this season (to Toulouse).

Castres were beaten in Clermont last week but are in good form having toppled Toulon and Montpellier in their two previous games.

The hosts will be without flank Ibrahim Diarra and fly-half Dan Kirkpatrick but welcome back Romain Teulet.

Agen are missing fly-half Raphael Lagarde and wing Nafi Tuitavake but have been bolstered by the return of full-back Silvere Tian.